Geant4 - Particles and Processes - Indico
Version and Processes in Geant4Vladimir Ivantchenko CERN, Geneva, Switzerland & Tomsk State University, RussiaGeant4 Advanced Course28 September 2020Version Geant4 interface to physics Geant4 basic interfaces to physics Geant4 Particles Geant4 Processes Physics Lists Elecromagnetic(EM) physics EM physics overview EM physics constructors User interface to EM physics 2Geant4 basic interface to physics The interface of Geant4 kernel to physics is abstract Base physics abstract classes are following: The G4ParticleDefinitionobjects shared between threads The G4VProcessthread local objects The G4ProcessManagerthread local interface class Configuration of physics is prepared in the G4VUserPhysicsListmandatory user class These interfaces are stable for ~20 years allowing users to work with different Geant4 versions and providing a basis for new developments Concrete physics is implemented in physics models and cross section classes Alternative models and cross sections are provided in Geant4 libraries A user may be also a developer of a custom particle, process, physics model, or cross section 3GEANT4 PARTICLES4Geant4 Particles G4ParticleDefinition is the main object keeping static information about Particles Name, mass, charge, quantum numbers, decay Stable Particles Leptons: e.
–Used practically in all kind of Geant4 applications • the low energy EM part: includes special treatments for low energy e-/+, gammas and charged hadrons: –more sophisticated approximations valid down to lower energies e.g. more atomic shell structure details –some of these processes will be valid down to below keV but some can be
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